[CLOSED] leaderstats variables not saving for DataStoreService?

I've been trying fix this problem of not saving my variables, I'm using 2 variables and I'm also using leaderstats with 2 intValues. I do not know why my data isn't saving. This is server script, and it's in ServerScriptService. The print statement at line 44 works, however, the print statement at line 64 doesn't.

local DSS = game:GetService("DataStoreService")
local mDS = DSS:GetDataStore("MyDataStore") 
game.Players.PlayerAdded:Connect(function(player)
	local key = player.UserId
	
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player
	
	local wins = Instance.new("IntValue")
	wins.Name = "Wins"
	wins.Parent = leaderstats
	
	local xp = Instance.new("IntValue")
	xp.Name = "XP"
	xp.Parent = leaderstats
	
	local data 
	
	local success, ErrorCode = pcall(function()
		return mDS:GetAsync(tostring(key))
	end)
	
	if success then
		if data then
			wins.Value = data["Wins"]
			xp.Value = data["XP"]
		end
	else
		warn("Error while saving: "..ErrorCode)
	end	
end)

game.Players.PlayerRemoving:Connect(function(player)
	local key = player.UserId
	local dataTable = { 
		Wins = player.leaderstats.Wins.Value,
		XP = player.leaderstats.XP.Value
	}
	local success, ErrorCode = pcall(function()
		mDS:SetAsync(tostring(key),dataTable)
	end)
	if success then
		print("Data saved!")
	else
		warn("Error while saving: "..ErrorCode)
	end	
	
end)

game:BindToClose(function(player)
	local key
	for _, v in pairs(game:GetService('Players'):GetPlayers()) do
		key = v.UserId
		local dataTable = {
			Wins = v.leaderstats.Wins.Value,
			XP = v.leaderstats.XP.Value
		}
		spawn(function()
			local success, ErrorCode = pcall(function()
				mDS:SetAsync(tostring(key),dataTable)
			end)
			if success then
				print("Data2 Saved!")
			else
				print("Error While Saving:"..ErrorCode)
			end
		end)
	end
end)

I've tested this both in-game and in studio and they do not work. Also, if possible, how can I change mDS:SetAsync to mDS:UpdateAsync? Any help is appreciated. Edit: I switched to DataStore2 (as recommended by some people and friends) and so far, it actually saved my data. To future people who read this, just because I used DataStore2, doesn't mean you should either. Use either DataStoreService or DataStore2, depending which one is easier. Best of luck, future developers!